11
Instruction manual
| Types SDV-R and SDV-R-AR distribution circuit breakers
Preparation for installation
Prior to installation of the type SDV-R
distribution circuit breaker, careful design,
planning, and construction of the foundation
or base on which the circuit breaker will rest
must be made. A thorough analysis and
careful construction may alleviate many
problems at the time of installation, and
during operation. It is important that a
relatively level surface be provided capable of
supporting the weight of the type SDV-R
distribution circuit breaker, and 0.75-inch
diameter anchor bolts are recommended.
Figure 4: Anchoring type SDV-R distribution
circuit breaker on page 13 illustrates typical
locations for anchor bolts. No special leveling
procedures are required.
Prior to installation of a type SDV-R
distribution circuit breaker, study this
instruction book and the circuit breaker
drawings, such as general arrangement/
outline drawing, schematic diagram,
connection diagrams, current transformer
connection diagram, electrical bill of material,
and nameplate engraving.
Special attention should be given to the
foundation information contained in this
instruction manual as well as the information
provided on the equipment drawings. Verify
the foundation conforms to the requirements
described in this instruction manual and the
general arrangement/outline drawing.
The type SDV-R distribution circuit breaker is
shipped with the legs attached. The legs must
be set to the desired height.
Setting leg height
The type SDV-R distribution circuit breaker is
shipped with the legs set to a low level (and
on some units, turned outward). The legs
must be removed and installed correctly.
Remove the legs from the enclosure (if
shipped turned outward). Raise the enclosure
and install the legs at the desired height.
The legs must be installed and turned inward,
so that the two sides of the each leg are
adjacent to the enclosure sides and the hole
at the bottom of the leg is inside the
perimeter of the enclosure, as in Figure 3:
Outline drawing on page 12.
Use anti-seize compound (Loctite* 77164 or
77124 nickel anti-seize) on the 1/2-13 SAE
stainless steel cap screws used to secure the
legs to facilitate removal of the legs should
it be required in the future. Torque the 1/2-
13 SAE hardware to 50-75 ft-lbs (80-
102 Nm)
The height (as installed) between the
mounting surface (foundation) and the
bottom of the enclosure must be at least 4”
(102 mm) and no higher than 28” (711 mm).
The type SDV-R-AR circuit breaker must be
installed with the arc-exhaust vents at least
79” (2.0 m) above finished grade.
High-seismic installations
Figure 3: Outline drawing on page 12 shows
optional cross-braces installed for high-
seismic requirements.
Cross braces can be installed if the bottom of
the enclosure is at least 12” (330 mm) above
the foundation.
The cross braces consist of steel links that are
adaptable for all installation heights (from 13”
(330 mm) to 28” (711 mm). Install the cross
braces as shown in the illustration. The end of
the link with a single hole is bolted to the
lowest hole on the leg. The opposite link is
bolted with the single-hole end bolted to one
of the two highest exposed holes in the leg
below the enclosure. The highest hole or
second highest hole is used, as necessary to
allow alignment. Then, bolt the two links
together towards the middle, using whichever
set of holes align.
When optional cross braces are furnished,
install all eight cross braces (four sets) to
obtain the required seismic performance.
Location
The circuit breaker should be located so that
it is readily accessible for manual operation
and inspection. Ample clearance should be
provided for doors and panels to swing open,
or to be removed for servicing the circuit
breaker.
* Loctite is a registered trademark of
Henkel Corporation.
Installation
